US2833396A - Lateral auger discharge - Google Patents

Description

May 6, 1958 F. E. KNOEDLER LATERAL AUGER DISCHARGE 2 Sheets-Sheet 1 Filed April 12, 195'! .R M/ R E may N\ w m N h mw n 1 M H H MI E 5 3. D 5 rm J Il'l/l/H l 11 ..l a

F. E. KNOEDLER LATERAL AUGER DISCHARGE May 6, 1958 2 Sheets-Sheet 2 Filed April. 12, 1957 INVENTOR 5250 E. ffvaaxa? Rm FZH'; 75.

United States Patent LATERAL AUGER DISCHARGE Fred E. Knoedler, Streator, lll., assignor to Knoedler Manufacturers, Inc., Streator, 111., a corporation of Illinois Application April 12, 1957, Serial No. 652,622

6 Claims. (Cl. 198-213) This invention relates to conveyor systems and particularly to ground material conveyor systems of general utility capable of moving ground corn having shucks therein, ground corn cobs and similar materials which are difficult to convey.

The present invention is directed to conveyor systems which may be mounted as permanent installations, or may be mounted on wagons for portability or may be part of grinding systems such as burr mills, the burr mills being either permanently mounted or mounted for portability. Certain of the advantages of the present invention are best illustrated in conjunction with a portable burr mill and, accordingly, the invention will be illustrated and described in this combination. It is to be understood that the conveyor system can be used in other combinations or by itself as explained above.

Certain burr mills have heretofore been provided with a generally vertically disposed auger which carries all ground material upwardly to an elevated position. The vertical discharge auger then empties into a lateral gravity actuated discharge or into a lateral auger discharge. In the case of lateral auger discharge systems, the husks tend to wrap around the upper end of the vertical discharge auger and eventually block or obstruct the junction between the vertical and lateral discharge angers. Ground corn cobs tend to cling and often will pack in conveyor systems and act as a solid block whereby to clog the system.

Machines using lateral discharge angers also have tended to be top heavy because of the presence of the lateral auger and its accompanying drive and support members. When efforts were made to lighten the drive and support members, then the juncture between the vertical and lateral discharge angers could not withstand the rough usage which these parts undergo particularly when positioned on a portable burr mill.

Accordingly, it is an object of the present invention to provide an improved auger discharge system utilizing a lateral discharge auger at the upper end of a vertical auger, and particularly such a system adapted to convey ground corn having husks mixed therewith, ground cobs, and similar materials which are difiicult to convey.

Another object of the invention is to provide in a lateral discharge auger of the type set forth improved means to prevent wrapping of corn husks and the like about the parts at the junction of the lateral auger with an associated vertical auger and thus eliminate blocking of the auger discharge system. 7

Yet another object of the invention is to provide an improved lateral auger discharge system for use on portable burr mills which is simple and light in construction and yet structurally strong so that the discharge system and particularly the junction between the lateral and vertical angers can withstand the rough usage to which these parts are subjected while being moved about relatively rough farm terrain.

Still another object of the invention is to provide in an anger discharge system including'a lateral auger communicating with a vertical auger improved drive mechanism.

In conjunction with the foregoing object it is an object of the invention to provide an improved drive mechanism wherein the grinding burrs of an associated burr mill, the vertical auger and the lateral auger are driven from a common source of power.

Still another object of the invention is to provide in a lateral auger discharge system an improved drive mechanism providing positive drive from the associated vertical auger to the lateral auger, the drive being non-plugging when com husks, ground corn cobs and the like are fed therethrough.

These and other objects and advantages of the invention will be better understood from the following description when taken in conjunction with the accompanying drawings. In the drawings wherein like reference numerals have been utilized to designate like parts throughout:

Figure 1 is a view partially in vertical section with certain parts broken away of a burr mill having an anger discharge made in accordance With and embodying the principles of the present invention;

Figure 2 is an enlarged partial view in vertical section illustrating the junction between the vertical auger conveyor and the horizontal auger conveyor;

Figure 3 is a view in horizontal section through the horizontal auger illustrated in Figure 2 substantially as seen in the direction of the arrows along the line 33 thereof; and

Figure 4 is a view in vertical section through the drive mechanism interconnecting the vertical and lateral augers illustrated in Figure 2 of the drawings.

Referring to Figure 1 of the drawings there is shown a burr mill generally designated by the numeral 10 in-' corporating therein a lateral auger discharge made in accordance with and embodying the principles of the present invention. It is to be understood however, that the lateral auger discharge and the principles of the present invention can be embodied in conveying systems separate from burr mills and in combination with other grinding devices. Burr mill 10 may be either stationary or mounted upon a wheeled frame whereby to make it portable, certain advantages of the present discharge system being more fully realized when burr mill 10is mounted for portability. Mill 10 includes in general a base 12 upon which is mounted the drive mechanism 14, the grinding chamber 16, and a hopper 18. Communicating with the outlet 19 from grinding chamber 16 and extending upwardly from base 12 is a vertical auger con-- veyor generally designated by the numeral 20 which connects at the upper end thereof with an outwardly and laterally extending discharge auger generally designated by the numeral 22.

Material to be ground is fed into hopper 18 and from there falls downwardly into a bowl 24 from which it is fed by gravity to the grinding burrs in grinding chamber 16. The ground material is swept into a chamber in the lower end of conveyor 20 which lifts the ground material upwardly into the lateral discharge auger 22.

Power to drive mill 10 and all parts thereof is derived from a tractor or other suitable prime mover and is applied to mill 10 through a drive shaft 26. A ball bearing assembly 28 supports one end of shaft 26 and a second ball bearing assembly 39 supports the other end of shaft 26. The inner or left hand end of shaft 26 as viewed in Figure 1 of the drawings has mounted thereon a bevel gear 32 which meshes with and drives a larger bevel gear 34. Gear 34 is mounted upon and drives a vertically ex tending power shaft 36.

The vertical positioning of shaft 36 is adjustable and more specifically the lower end of shaft 36 is supported a in a bearing on a bridge tree 38, bridge tree being pivotally supported by a block 40 at one end and supported by an attached rod 42 at the other end thereof. Rod 42- passes through the eye 44 of avertically disposed rod 46 and rod 46 extends upwardly to be engaged by a pair ofha-nd wheels 48. Resilientmounting of bridge tree 38.is provided by disposing a spring 50 about rod 46, the lower. end of spring 50 resting upon a housing 52 supported by base 12. The lower hand wheel 48 rests upon a sleeve 54 which surrounds rod and bears against the upper end of spring 50. By turning hand wheels 48 with repcct to rod 46, the bridge tree 38 can be lifted or lowered thus lifting or lowering shaft 36 as the case may be.

Shaft 36 provides the drive for the grinding burrs and is supported against lateral displacement by a first ball bearing assembly 56 mounted on a frame member 58 and a second ball bearing assembly 60 mountedon the bottom of the grinding chamber 16.

Grinding chamber 16 is defined in part by a cylindricalcasting having a cylindrical wall 62 and a bottom wall 64 on which ball bearing assembly 60 is mounted.

Casting 62 is supported by an upstanding cylindrical wall 66 supported in turn by base 12.

Disposed within grinding chamber 16 and supported by the cylindrical wall 62 are the grinding burrs generally designated by the numeral 72. Preferably the burrs 72 are disposed horizontally as illustrated. The movable burrs are driven by a drive member mounted on shaft 36 for rotation therewith.

Bowl 24 is, hinged to member 62 whereby bowl 24 can be swung from the position illustrated to a position to expose the grinding burrs. A clamp is also provided to clamp bowl 24 in the position shown in Figure 1 of the drawings. Mounted on top of bowl 24 is hopper 18. Hopper 18 has the upper portion thereof formed of sheet metal, the sheet metal portion being suitably secured to a casting 76. Casting 76 is in turn clamped to how] 24 by clamps such as clamp 78.

The material to be ground is fed downwardly through hopper 18 and bowl 24 between the grinding faces of burrs 72. y The ground material falls downwardly into a collecting chamber formed by cylindrical casting 62 and bottom wall 64. A pair ofrpaddles 92 is mounted upon shaft 36 .for rotation therewith and serve to push the ground material collected in the bottom of the grinding chamber. through the opening 19 in casting wall 62 into a collecting chamber 94 provided at the bottom of the vertical auger 20. Chamber 94 is formed by a horizontal bottom plate 96 mounted on frame 12 and a U- shaped vertical plate 98. An access door 100 is provided in plate 98, door 100 being hinged and provided with a latch. Atop plate 102 is provided to complete the col lecting'chamber 94.

Vertical conveyor 20 includes an anger generally designated by the numeral 104, auger 104 being formed of a tube or shaft 106 on which is mounted a helicoid auger flighting 108. The lower end of vertical auger 104 is supported in a ball bearing assembly 110 mounted on bottom plate 96. Drive for auger 104 is derived from shaft 26 through a bevel gear 112 mounted thereon. Gear 112 in turn meshes with a second bevel gear 114 secured to the lowerend of anger 104. It will be seen that vertical auger 104 is therefore driven at a rate having a definite relation to the rate at which the grinding burrs are driven.

Mounted on the upper end of housing 116 and rotatable with respect thereto is a second housing generally designated by the numeral 122 and including a cylindrical section 124. The joint between housings 116 and 122 is covered by a band 126, band 126 being capable of being clamped thereabout by means of a hand wheel 128 whereby to permit positioning of housings 116 and 122 at any desired angular displacement with respect to each other. Extending laterally outwardly from the upper end of cylindrical portion 124 is a pair of side plates 130. The lower edges of side plates 130 are shaped to extend upwardly and receive therebetween an upwardly inclined bottom'plate 132. Cylindrical portion 124, side plates 130 and bottom plate 132 are preferably secured together as by welding; Secured to the outer ends of plates 130 and 132 as by'welding is an annular mounting ring 134.

The upper end of tube 106 of vertical auger 104 extends into and is received by a housing generally designated by the numeral 136 mounted in the upper end of housing 122. Housing 136 includes a lower plate 138 shaped to close the upper end of cylindrical portion 124 and a vertical plate 140 which completes the enclosure of the upper endof cylindrical portion 124. Preferably plates 138 andz140 are welded to each other and in turn welded to the inner walls of housing 122 to complete gear housing 136 A removable cover plate 142 is provided so that access can be had to the top of housing 122 and particularly to the parts contained within gear housing 136. A first means of mounting cover plate 142 in operative position is provided by an L-shaped bracket 144 welded to plate 142 and having a nut 146 welded thereon. An aperture is provided in bracket 144 communicating with the opening in nut 146 and with an aperture in the wall of cylindrical housing portion 124. A bolt 148 is adapted to pass through the aligned apertures and engage nut 146. Plate 140 is provided with an inwardly directed flange 150 to which is welded a nut 152. A bolt 154 passes through aligned apertures in cover plate 142 and flange 150 to engage nut 152. Yet another means of attaching cover plate 142 in position is provided by a flange 156 formed thereon and engageable by a bolt 158 passing through the mounting ring 134.

The lateral discharge conveyor 22 includes a lateral auger generally designated by the numeral 160 and including a pipe or shaft 162 on which is. mounted helicoid auger flighting 164. Pipe 162 is disposed substantially perpendicular to pipe 106. The inner or left haifld end oflateral auger 160 is contained within and enclosed by the upper end of housing 122. The outwardly extending or right hand end of anger 160 is enclosed by a cylindrical housing 166. The end of housing 166 positioned toward housing 122 has a collar 168 extending therearound and attached thereto as by welding. Colflange 170, mounting ring 134 and flange 156. A bolt Auger 104 extends upwardly preferably above hopper 18 although for purposes of illustration vertical auger 104 has been foreshortened by having a section thereof broken away. The lower end of auger 104 is enclosed within chamber 94. forms a part of the enclosure of this chamber and upon plate 102 is a cylindrical housing 116. The lower end of housing 116 is provided with a laterally extending flange 118 which is secured to top plate 102 by any suitable means such as bolts 120. I

Mounted above plate 98 which and nut 172 also interconnects flange and mounting ring 134 at the bottom as viewed in Figure 1. Auger 160 terminates within housing 166. The material moved by auger 160 through housing 166 is delivered through a 45 cylindrical elbow generally designated by the numeral 174 and including an attachment portion 176 and a discharge portion 178. A plurality of sheet metal screws 180 interconnect attachment portion 176 and the outer end of housing. 166. I

The drive for lateral auger 160 is derived from the vertical auger 104. Referring particularly to Figures 2, 3 and 4 of the drawings it will be seen that the upper end of vertical auger tube 106 extends upwardly through an aperture 182 in gear housing plate 138 and receives a shaft 184; shaft 184 being connected to tube 106 such as by a pin 186 for driving connection therewith. ,Shaft 184.

carries a bevel gear 188 held in position thereon by means of a Woodruff key 190. Disposed above gear 188 is a pair of machine bushings 192 above which is positioned a bearing 194. Bearing 194 has an outwardly extending flange 196 which bears against the under side of cover plate 142 and a cylindrical portion 198 which extends upwardly through an aperture in plate 142. A cotter key 200 is provided at the outermost end of shaft 184 to hold the parts in operative position. There also is provided another machine bushing 202 above bearing 194 and a shield 204 covering bushing 202.

Lateral auger 160 is completely supported by the bearing structure contained within and including the bearing housing 136. More specifically tube 162 receives in the left hand end thereof as view in Figures 1 and 2 a shaft 206 which is secured to tube 162 by means of a pin 208. A reduced section 210 of shaft 206 passes through a bearing 212 substantially identical with bearing 194. Bearing 212 includes a cylindrical portion 214 passing through an aperture in housing wall 140 and an outwardly extending flange 216 disposed within housing 136 and bearing against the inner side of plate 140. Mounted on reduced shaft portion 210 is a bevel gear 218 meshing with and driven by bevel gear 188 which is connected to vertical auger tube 196. A Woodruff key 220 holds gear 218 in operative position on reduced shaft portion 210 and a snap ring 222 is provided.

It will be seen from the above described parts that lateral auger 160 is driven by the prime mover attached to shaft 26. More specifically shaft 26 drives bevel gears 112 and. 114 whereby to turn vertical auger tube 106. Tube 106 through shaft 184 drives bevel gears 188 and 218. Bevel gear 218 drives shaft 206 and pin 208 and thus, lateral auger tube 162. The weight of the outer or right hand end of lateral auger 160 as viewed in Fig.- ures l and 2 results in a force tending to lower the right hand or outer end of auger 160 and raise gear 218 using bearing 212 as a pivot. This force tends to lift bevel gear 188 and attached parts upwardly whereby tending to raise machine bushings 192. Bushings 192 bear against 194 and particularly flange 196 which rests and bears against the under side of cover plate 142. It will be seen therefore that the resultant force from the weight of lateral auger 160 is borne by the bearing 194. Any axial thrust directed outwardly along the axis of auger 160 is resisted by flange 216 on bearing 212 and all thrust in the other direction is transmitted through the bevel gears 188 and 218 to the bearing 194 which through the cylindrical portion 198 thereof bears against the walls of the associated aperture through cover plate 142.

The axes of angers 104 and 160 lie in a common plane. This disposition of the axes of the augers in large part contributes to the simplicity of the drive mechanism described above. This simplicity of drive in turn provides a light construction at the juncture of the two angers. This drive mechanism in turn is made possible by the provision of the expansion or transfer chamber provided at the juncture of the two augers and defined by plates 130 and 132.

When grinding whole corn with shucks attached thereto or mixed therewith or similar stringy material, there is a tendency of certain prior constructions to wrap these materials around the upper end of the vertical auger thereby clogging and blocking the junction between the vertical and lateral angers. Ground corn cobs tend to cling and pack whereby to act substantially as a solid mass blocking prior conveying systems. There also has been a tendency in certain structures for ground material to work up into the gear housing 136. The present invention provides a simple and effective construction for preventing clogging at the junction of the vertical and lateral augers and of preventing ground material from entering gear housing 136.

More specifically there is provided on vertical-auger.

6 shaft 106 at a point spaced a short distance below gear housing plate 138 a horizontally disposed circular plate 224. Plate 224 is imperforate and has a diameter substantially equal to the greatest diameter of the auger fiighting 108. Plate 224 positively blocks entry of ground material into gear housing 136 and particularly through the aperture 182 in plate 138 that receives auger pipe 106.

Also mounted on pipe 106 is a pair of outwardly extending fins 226 and 228. Fin 228 is substantially rectangular in shape and has a width substantially equal to the distance between the outer surface of pipe 106 and the outer periphery of plate 224. Plate 228 extends downwardly from plate 224 and terminates at a point adjacent the lowermost edge of housing plate 132. The uppermost edge of the auger fiighting 108 overlaps the lower edge of plate 228 and is suitably affixed thereto as by welding. I

Fin 226 has a maximum width also equal to the distance between the outer surface of pipe 106 and the outer periphery of plate 224, both fins 226 and 228 extending laterally outwardly from pipe 106 as is best illustrated in Figure 3 of the drawings. The lowermost extent of plate 226 is along pipe 106 and to a point 230 level with the meeting line between plate 228 and auger flighting 108. The lowerv edge 232 of plate 226 extends upwardly from point 230 at an angle approximately 45 with respect to the axis of pipe 106'.

The fins 226 and 228 prevent shucks and similar materials from wrapping about the tube 106 and with the assistance of plate 224 serve efiectively to move the husks upwardly and to the right as viewed in Figures -1 and 2 of the drawings. The expansion chamber defined by plates and 132 at the upper end of vertical auger 104 receives the ground material from fins 226-228. The expansion chamber in cooperation with the fins permit the conveyed material to maintain its, loose andrelatively fluid condition so that it is engaged by lateral auger for movement to the discharge end thereof. All other, ground material is also moved by fins 226 and 228 along plate 132 to a position where it can be engaged and conveyed-by lateral auger 160.

The junction between the vertical auger 104 and the lateral auger 160 is particularly rugged as is the drive mechanism interconnecting the two angers. This construction is on the other hand light and relatively simple whereby particularly to adapt it for use on portable burr mills. Such a structure will withstand the rough usage to which it is subjected during movement over rough terrain on a farm. More specifically the burr mill 10 is in a sense top heavy in that the auger dis charge structure is held at an elevated point which may be as much as eight feet above the ground and is a relatively bulky piece of equipment. Such a construction is subjected to strong stresses and strains during movement on rough terrain. The described construction readily withstands such use. p

Both the vertical auger 104 and the lateral auger 106 are driven by the same prime mover and at a fixed ratio with respect to each other since the lateral auger 160 is driven by the vertical auger 104 through bevel gears 188' and 218. Both augers are in turn driven by the same source of power which drives the grinding burrs and are driven at a rate which is in a fixed ratio with the rate of grinding. The present conveying system has a high rate of delivery. More specifically'augers.

104 and 160 are preferably operated at between 500 and 1000 R. P. M. as contrasted with rates of 250 to 500 delivering all the ground material fed'thereto; .All'of these factors provide for a'positive and non-plugging delivery and discharge of ground material; The lateral 160 is capable of delivering material substantial distances andof pushing the materials into a partially filled bin'or the like since the capacity of auger 160 is substantially greaterthan that of the vertical auger 104. It will be seen that there has been provided a burr inill and particularly a lateral auger discharge system for a. portable bu-rr mill which fills all the objects and possesses all of the advantages set forth above. Although a preferred form of the invention has been shown for purposes of illustration, it is to be understood that various changes and modifications can be made therein without departing from the" spirit and "scope of the invention.-

Accordingly, the invention is to be limited only as set forthiiiifth e following iclaims,

' 11;] A conveyrn to move material, comprising a vertical auger mounted to pick up the material, said vertical auger including an auger shaft and anauger fiighting mounted thereoma first housing enclosingsaid vertical auger and including a portion extending laterally outwardly therefrom at the upper end'thereof, the upper end of said vertical auger shaft being received in afirst thrust bearing mounted on said first housing, a lateral auger positioned in said lateral portion of said first housing, said lateral auger including a lateral auger shaft and a lateral auger fiighting mounted thereon, gears interconnecting the upper end of said vertical auger and the adjacent end of said lateral auger to provide driving connection therebetween,

a second housing mounted in said first housing and enclosing said gears and having apertures therein to receive said auger shafts, a thrust bearing mounted in said second housing and receiving said lateral auger shaft therethrough to support said lateral auger in cooperation with said gears with the outer end of said lateral auger suspended free, a plate mounted on said vertical auger shaft below and adjacent to said second housing, and a pair of fins extending radially outwardly from said auger shaft and downwardly from said plate, said plate and said fins cooperating to move material from the upper end of said vertical auger to the adjacent endof said lateral auger. 2.- A conveyor to move material, comprising a vertical auger mounted to pick up the material, said vertical auger including an auger shaft and an auger flighting mounted thereon, a first housing enclosing said vertical auger and including a portion extending laterally outwardly therefromatthe upper end thereof, the upper end of said vertical auger shaft being received in a first thrust bearing mountedon said first housing, a lateral auger positioned in said lateral portion of said first housing, said lateral auger including a lateral auger shaft and a lateral auger fiighting mounted thereon, gears interconnecting the upper endof said vertical auger and the adjacent end of said'lateral auger to provide driving connection therebetween, a second housing mounted in said first housing andenclosing said gears and having apertures therein to receive said auger shafts, a thrust bearing mounted in said second housing and receiving said lateral auger shaft therethrough to support said lateral anger with the outer end of said lateral auger suspended free, a plate mounted on said vertical auger shaft below and adjacent to said second housing, and a pair of fins extending radially outwardly -from said auger shaft and downwardly from said plate, said plate and said fins cooperating to move material from, the upper end ofsaid vertical auge to the adjacent end of said lateral auger.

3. A conveyor as described in claim 1 in which the gears interconnecting the adjacent ends of the augers consist of a bevel gear mounted on the end of the lateral auger shaft and a cooperating bevel gear mounted above said first named bevel gear on the vertical auger shaft and bearing against a thrust bearing supported in the top of said second housing.

4. A conveyor forrnoving material, comprising a vertical auger mounted to pick up the material, said vertical auger including an auger shaft with an auger fiighting thereon, :a'first housing enclosing said vertical auger and including a portion extending laterally outwardly therefrom at the upper end thereof, the upper end of said vertical auger shaft being received in a thrust bearing mounted on said first housing, a lateral auger positioned in said lateral portion of said first housing, said lateral auger including a lateralauger shaft with a lateral auger flighting thereon, gears interconnecting the upper end of said vertical auger and the adjacent end of said lateral auger to provide driving interconnection therebetween, a second housing mounted in said first housing and enclosing said gears and having apertures therein through which the upper end portion of the shaft of said vertical auger and the adjacent end portion of the shaft of said lateral auger respectively extend, and a bearing mounted on said second housing rotatably supporting said lateral auger" shaft with the outer end of said lateral auger suspended freely in cantilever fashion.

5. A conveyor for moving material, comprising a vertical auger mounted to pick up the material, said vertical auger including an anger shaft and an auger fiighting thereon, a first housing enclosing said vertical auger and including a portion extending laterally outwardly therefrom at the upper end thereof, a lateral auger positioned in said lateral portion of said first housing, said lateral auger including a lateral auger shaft and a lateral auger fiighting thereon, a second housing mounted in said first housing and enclosing the adjacent ends of said auger shafts and having apertures therein through which said shafts extend, gears interconnecting the upper end of said vertical auger and the adjacent end of said lateral auger to provide driving interconnection therebetween, a first bearing mounted on one of said housings and receiving the upper end of said vertical auger, a second bearing mounted on one of said housings and rotatably supporting said lateral auger shaft adjacent said gears with the lateral auger extending outwardly therefrom, a plate mounted in fixed position on said vertical auger shaft adjacent said second housing, and a pair of fins extending radially outwardly from said auger shaft below said plate and from substantially the bottom face of said plate downwardly substantially to the level of the upper edge of the vertical auger fiighting, said plate and said fins cooperating to move material from the upper end of said vertical auger to the adjacent end of said lateral auger.

6. A conveyor for moving material, comprising a vertical auger mounted to pick up the material, said vertical auger including an anger shaft and an anger flighting thereon, a first housing enclosing said vertical auger and including a portion extending laterally outwardly therefrom at the upper end thereof, a lateral auger positioned in said lateral portion of said first housing, said lateral auger including a lateral auger shaft and a lateral auger flighting thereon, a second housing mounted in said first housing and enclosing the adjacent ends of said auger shafts and having apertures therein through which said shafts extend, gears interconnecting the upper end of said vertical auger and the adjacent end of said lateral auger to provide driving interconnection therebetween, a first bearing mounted on one of said housings and receiving the upper end of said vertical auger, a second bearing mounted on one of said housings and rotatably supporting said lateral auger shaft adjacent said gears with the lateral auger extending outwardly therefrom, a plate mounted in a fixed position on said vertical auger shaft adjacent said second housing, the diameter of said plate being substantially equal to the outer dimension of said vertical auger flighting, and a pair of fins extending radially outwardly from said vertical auger shaft substantially to the perimeter of said plate and downwardly from said plate, one of said fins being connected to the upper end of said vertical auger upper end of said vertical auger to the adjacent and of said lateral auger.

References Cited in the file of this patent UNITED STATES PATENTS SimOnds July 17, 1883 Bakkethun Nov. 19, 1889 Burrells Nov. 20, 1900 Smith Nov. 26, 1901 Grifi'iths Dec. 17, 1901 Baird Sept. 22, 1908 Gauntt Oct. 11, 1910 Williams June 16, 1914 Caldwell July 17, 1923 Fahnestock Sept. 21, 1926 Bell Sept. 6, 1927 Wightman Feb. 26, 1929 Anderson Aug. 27, 1929 Hale Nov. 4, 1930 Tellefsen Dec. 16, 1930 Elliott Aug. 11, 1931 10 Bailey July 12, 1932 Meeks May 2, 1933 Schulthess Nov. 30, 1937 Carter Jan. 9, 1940 Weisenberger Sept. 15, 1942 Benzel Sept. 15, 1942 Hall Feb. 5, 1.946 Kidd May 6, 1947 Beyer Aug. 23, 1949 Mitchell Aug. 23, 1949 Miller Sept. 13, 1949 Herr Mar. 27, 1951 Ayers July 17, 1951 Erickson Apr. 5, 1955 Wierner June 28, 1955 Yoerger Oct 16, 1956 FOREIGN PATENTS France June 20, 1951 Switzerland June 1, 1953 Great Britain Aug. 1, 1956

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